. 2017 Apr 21;215(11):1653–1656. doi: 10.1093/infdis/jix194

Table 1.

Classification of Chlamydia trachomatis Infection Based on Different Combinations of Anti–Chlamydia trachomatis Immunoglobulin G1 and Immunoglobulin G3 Serostatus From Women Classified as Having Spontaneous Resolution by a Nucleic Acid Amplification Test

Type of infection	IgG subclass responses				No. of subjects (%)
Type of infection	Treatment visit		Follow-up visit		No. of subjects (%)
Recent ^a	IgG1+	IgG3+	IgG1−	IgG3+	2 (2.60)
Recent ^a	IgG1+	IgG3+	IgG1+	IgG3+	55 (71.40)
Primary ^b	IgG1−	IgG3+	IgG1+	IgG3+	1 (1.30)
Primary ^b	IgG1−	IgG3−	IgG1+	IgG3+	1 (1.30)
Acute ^c	IgG1+	IgG3−	IgG1+	IgG3+	2 (2.60)
Remote ^d	IgG1+	IgG3+	IgG1−	IgG3−	1 (1.30)
	IgG1+	IgG3+	IgG1+	IgG3−	3 (3.90)
	IgG1+	IgG3−	IgG1+	IgG3−	9 (11.70)
No infection	IgG1−	IgG3−	IgG1−	IgG3−	3 (3.90)

Abbreviations: IgG, immunoglobulin G; IgG1, immunoglobulin G1; IgG3, immunoglobulin G3.

^aRecently resolved Chlamydia trachomatis infection.

^bAn individual’s first Chlamydia trachomatis infection.

^cEarly stage of infection.

^dIndividual was infected in the distant past (likely years ago).